This black Mount Adapter from Metabones is a manual adapter that allows you to use Leica M lenses on cameras with a Micro Four Thirds mount. It is designed to allow you to reach infinity focus while maintaining the correct registration distance for good optical quality. Both the front and back mount are made of brass and plated with chromium, helping ensure a proper fit and smooth operation. Finally, the inside of the adapter features a black matte color as well as flocked felt to reduce internal reflections and minimize optical problems.